I was trying to decide the same thing, as i liked valeting my car at the weekends, so i got myself a g220 in march from cleanyourcar. I was a total novice at using it but if you look here you will see how a friends car turned out:

http://www.cleanyourcar.co.uk/forum/...er=asc&start=0

I amazed myself how good the machine polisher worked, even to an amateur!!!